Q21 of 30 Page 88

Is the position of a star as seen by us its true position? Justify your answer.

No, the position of a star as seen by us is not its true position. The stars appears slightly higher than the actual position because light coming from Stars suffers refractions due to different layers of atmosphere which is due to different refractive indices value. It seems as if stars are slightly higher than they actually appear.


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19

How will you use two identical prisms so that a narrow beam of white light incident on one prism emerges out of the second prism as white light? Draw the diagram.

 20

Draw a ray diagram showing the dispersion through a prism when a narrow beam of white light is incident on one of its refracting surfaces. Also indicate the order of the colours of the spectrum obtained.

 22

Why do we see a rainbow in the sky only after rainfall?

 23

Why is the colour of the clear sky blue?